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And you got it perfectly! Really nice image. Have you considered cropping it a little to reduce the prominence of the lower background and right side? It's a stunning photo as is, but a slight crop might help to keep the viewers' attention from straying away from those magnificently imaged birds.

Thanks for the comment Leslie. You are right, I could have cropped the picture somewhat more on the bottom and the sides. I probably found  the blurred patches - I don't remember what it was - not uninsteresting as contrasting structures, also for their colors

For some reason, the inclusion of the bottom half as cropped increases the sense of motion.

Absolutely wonderful. First thought was: "that's really cool!", next was " how ever did he do that?". Excellent work. Thank you.

Excellent and precise use of panning, composition maybe a little bit too much shifted to the center but still stunning image. 

Beautiful flight!